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dm: pci: Allow delaying auto-config until after relocation

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At present PCI auto-configuration happens in U-Boot both before and after
relocation. This is a waste of time and may mess up static addresses used
in board_init_f(). Adjust the code to supporting doing auto-configuration
once, after relocation, under control of a device-tree property.

This is needed for Apollo Lake for debugging the silicon-init code. Once
the UART is moved to a different MMIO address the debug UART does not work
and any debug output in Apollo Lake's arch_fsp_init_r() causes a hang.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass
2019-12-06 21:41:37 -07:00
committed by Bin Meng
parent b14c533986
commit 2206ac248a
3 changed files with 42 additions and 6 deletions
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15
drivers/pci/pci-uclass.c
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@@ -975,12 +975,15 @@ static int pci_uclass_pre_probe(struct udevice *bus)
hose->bus = bus;
hose->first_busno = bus->seq;
hose->last_busno = bus->seq;
hose->skip_auto_config_until_reloc =
dev_read_bool(bus, "u-boot,skip-auto-config-until-reloc");
return 0;
}
static int pci_uclass_post_probe(struct udevice *bus)
{
struct pci_controller *hose = dev_get_uclass_priv(bus);
int ret;
debug("%s: probing bus %d\n", __func__, bus->seq);
@@ -988,11 +991,13 @@ static int pci_uclass_post_probe(struct udevice *bus)
if (ret)
return ret;
#if CONFIG_IS_ENABLED(PCI_PNP)
ret = pci_auto_config_devices(bus);
if (ret < 0)
return ret;
#endif
if (CONFIG_IS_ENABLED(PCI_PNP) &&
(!hose->skip_auto_config_until_reloc ||
(gd->flags & GD_FLG_RELOC))) {
ret = pci_auto_config_devices(bus);
if (ret < 0)
return log_msg_ret("pci auto-config", ret);
}
#if defined(CONFIG_X86) && defined(CONFIG_HAVE_FSP)
/*